the hilt should be turned 180º, in other words it has to face the other way around. Please observe other Javanese krises on the forum and you will understand how to turn it.
The Mendak or as you say " ring" can be purchased there are many sellers who sell rings of many types. You need one which would go on a a Keris like this please take a look here
http://www.vikingsword.com/vb/showth...=madura+mendak